London climate — normals and trends
London (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.1 °C and it receives 991 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (21.0 °C on average) and the coldest is January (-5.4 °C). Rainfall peaks in June.
London averages 135 frost days, 8 hot days (≥ 30 °C) and 138 rainy days per year.
London has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 147 to 123 per year over the period.
The hottest day of the period reached 36.2 °C (on 21 July 2011) and the coldest -31.7 °C (on 16 February 2015).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
LondonOntario
- coords
- 42.98°, -81.23°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.1°C
Average daily high
12.6°C
Average daily low
3.5°C
Annual rainfall
991mm
Sunshine / day
8.8h
Mean relative humidity
74%
Average peak wind
18.8km/h
Seasonal range
26.4°C
Frost days (< 0 °C)
135 d/yr
Hot days (≥ 30 °C)
8 d/yr
Rainy days (≥ 1 mm)
138 d/yr
Annual snowfall
106.4 cm
Average feels-like high
10.4 °C
Average feels-like low
0.3 °C
Average peak gust
40.0 km/h
Tropical nights (≥ 20 °C)
10 d/yr
Solar radiation
14.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.34 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
36.2 °C
21 July 2011
Coldest day
-31.7 °C
16 February 2015
Wettest day
67 mm
15 October 1954
Windiest day
51.8 km/h
13 November 2003
Strongest gust
110.2 km/h
14 January 1940
Hottest feels-like
42.4 °C
14 July 1995
Coldest feels-like
-36.5 °C
16 February 2015
Snowiest day
26.0 cm
25 February 1965
Sunniest day
15.0 h
14 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -3.3 °C | -1.5 °C | 48 mm | -18 mm |
| Feb | -2.0 °C | -1.2 °C | 62 mm | +3 mm |
| Mar | 8.6 °C | +3.9 °C | 103 mm | +27 mm |
| Apr | 13.0 °C | +1.0 °C | 88 mm | -3 mm |
| May | 17.1 °C | -1.5 °C | 85 mm | -8 mm |
| Jun | 25.5 °C | +1.6 °C | 87 mm | -14 mm |
| Jul | 27.4 °C | +1.4 °C | 98 mm | -3 mm |
| Aug | 24.9 °C | 0.0 °C | 52 mm | -39 mm |
| Sep | 23.4 °C | +2.3 °C | 52 mm | -32 mm |
| Oct | 16.4 °C | +1.9 °C | 67 mm | -11 mm |
| Nov | 6.9 °C | -0.3 °C | 62 mm | -19 mm |
| Dec | 0.1 °C | -0.8 °C | 106 mm | +32 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of London?
London has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.1 °C and it receives 991 mm of precipitation per year.
What is the hottest day ever recorded in London?
The hottest day measured in London between 1940 and 2025 was 21 July 2011, reaching 36.2 °C.
What is the coldest day in London?
The coldest day measured in London between 1940 and 2025 was 16 February 2015, at -31.7 °C.
Does it snow in London?
Yes. London gets on average 106.4 cm of snow per year and has around 135 frost days.
Has the climate of London warmed?
Yes: London warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in London?
The wettest day measured in London between 1940 and 2025 was 15 October 1954, with 67 mm of rain in 24 hours.
What was the windiest day in London?
The windiest day measured in London between 1940 and 2025 was 13 November 2003, with winds reaching 51.8 km/h.
What is the warmest month in London?
The warmest month in London is July (21.0 °C on average); the coldest is January (-5.4 °C).
How much does it rain in London?
London receives on average 991 mm of precipitation per year, spread over about 138 rainy days.
Is it sunny in London?
London gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in London?
The heaviest 24-hour snowfall measured in London between 1940 and 2025 was 25 February 1965, with 26.0 cm.
Are there tropical nights in London?
Yes: London has on average 10 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in London?
In London, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 14 July 1995, and the lowest was -36.5 °C on 16 February 2015.
Compare London with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around London